The most effective way for the aircrafts to defend against infrared-guided missiles is to fit with infrared decoy system or infrared jamming device. In the article, the throwing process of infrared decoy on the aircrafts is analyzed, and then its classical interior ballistic model including physical model and mathematical model is established. The ejection process of the decoy is simulated by numerical method. And the ballistic curves such as v~t curve of the decoy as well as the ejection cartridge case are given.
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